Final answer:
The subject of this question is Social Studies. Anti-terrorism programs employ overt security measures to establish a physical presence that creates the perception of impenetrability to a threat.
Step-by-step explanation:
The subject of this question is Social Studies.
Anti-terrorism programs employ overt security measures to establish a physical presence that creates the perception of impenetrability to a threat. These measures include activities such as increasing security personnel, conducting visible patrols, implementing surveillance systems, and enhancing security infrastructure. These actions aim to deter potential threats by giving the impression that it would be difficult or impossible to carry out an attack.